\begin{document}${q_0}= 2.44$\end{document} on the magnetic axis and \begin{document}${q_a}= 7.13$\end{document} on the plasma boundary. And, the minimum safety factor \begin{document}${q_{\min }}$\end{document} is 1.60. The structure of this kind of weakly negative magnetic shear can generate higher radio of the plasma pressure to the magnetic pressure and it is the important feature of the advanced steady-state scenario. Using MARS code, for two cases: without wall and with ideal wall, the results of growth rates of the external kink modes for different values of \begin{document}${\beta _{\rm N}}$\end{document} are obtained. The limit value of \begin{document}$\beta _{\rm N}^\text{no-wall}$\end{document} is 2.49 for the case without wall, and the limit value of \begin{document}$\beta _{\rm N}^\text{ideal-wall}$\end{document} is 3.48 for the case with ideal wall. Then, a parameter \begin{document}${C_\beta } = \left( {{\beta _{\rm{N}}} - \beta _{\rm{N}}^{{\text{no-wall}}}} \right)/\left( {\beta _{\rm{N}}^{{\text{ideal-wall }}} - \beta _{\rm{N}}^{{\text{no-wall }}}} \right)$\end{document} is defined. The research results in this work show that with the plasma pressure scaling factor \begin{document}${C_\beta } = 0.7$\end{document} and plasma rotation frequency \begin{document}${\Omega _{0}} = 1.1\% {\Omega _A}$\end{document}, the resistive wall modes can be completely stabilized without feedback control. And, with the plasma pressure scaling factor \begin{document}${C_\beta } = 0.7$\end{document} and the feedback gain \begin{document}$\left| G \right| = 0.6$\end{document}, only plasma rotation with the frequency \begin{document}${\Omega _{0}} = 0.2\% {\Omega _A}$\end{document} can stabilize the resistive wall modes. Therefore, a faster plasma rotation is required to stabilize the resistive wall modes by the plasma flow alone. The synergetic effects of the feedback and the toroidal plasma flow on the stability of the RWM can reduce plasma rotation threshold, which satisfies the requirements for the operation of the advanced tokamaks. The conclusion of this work has a certain reference for the engineering design and the operation of CFETR."> - 必威体育下载

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    Cao Qi-Qi, Liu Yue, Wang Shuo
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    • Abstract views:4134
    • PDF Downloads:63
    • Cited By:0
    Publishing process
    • Received Date:24 August 2020
    • Accepted Date:02 October 2020
    • Available Online:04 February 2021
    • Published Online:20 February 2021

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